Question

A boy whose mass is 40kg rams up a flight of 30 steps each. 150mm high, in 6s. Find the average power developed

Answer 1

We can find the average power developed from the formula:

$$P = \dfrac{W}{t} = \dfrac{mgh}{t},$$ $$P = \dfrac{40 kg \cdot 10 \dfrac{m}{s^2} \cdot 30 steps \cdot 150 mm \cdot \dfrac{1m}{1000mm}}{6 s} = 300 W.$$

Answer:

$P = 300 W.$